The type and selection of antennas in the RF RF circuit

I understand the working principle of antennas in RF radio Antenna type As described above, all conductors having a non-wavelength of λ / 4 in the free space are placed on one ground layer and provide a suitable voltage, then the conductor can be used as an antenna. Depending on the different wavelength, the antenna may be as long as the FM antennas of the car, or may be as short as the line on the signal buoy. For 2.4 GHz applications, most of the PCB antennas belong to the following types: 1. Wire antenna: This is a wire extending to the free space on the PCB, which is λ / 4 and is placed on the ground plane. This antenna is powered by a transmission line of 50-ω4 impedance. Typically, the performance and radiation range provided by the wire antenna are best due to the exposure of size and three dimensions. This wire It can be a straight line, a spiral or a loop. It is a three-dimensional (3D) structure in which the antenna is 5-5mm higher and protruded into the space. Figure 4: Wire antenna 2. PCB Antenna: It is a PCB circle on the PCB, and can draw it into linear traces, reverse F-shaped traces, serpentines or circular traces, or based on antenna type and space limit Swing curve, etc. In a PCB antenna, the antenna becomes a two-dimensional (2D) structure on the same plane of the PCB; See Figure 5. When the 3D antenna outside the bare to space is placed on the PCB layer as a 2D PCB trace, a certain guide must be followed. In general, compared with the wire antenna, it requires a larger PCB space, the efficiency is low, but the cost is low, and it is easy to manufacture and provide an acceptable wireless distance to BLE applications. Figure 5. PCB antenna. 3. Chip antenna: This is an antenna with conductor, antenna and conductor are assembled in a small IC package. This is useful when the printing PCB antenna is limited or supported by 3D wire antennas. See Figure 6 for a Bluetooth module that contains the chip antenna. The size of the antenna and module is given below Comparison of 1 cents coin. Figure 6. CYPRESS EZ BLE module with chip antennas (10 mm × 10 mm) Antenna selection The choice of antennas depends on its application, the size, cost, radiation range, and directionality of the available board. Bluetooth low power (BLE) application (such as wireless mouse) requires only 10 feet of radiation range and several Kbps data rates. However, for remote applications with speech recognition, a room is required to set an antenna, which is about 20 feet in the radiation range, and its data rate is 64 kbps. How to consider the antenna parameters in the RF circuit

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